CN105874329A - Apparatus and method of detecting defect of steel plate - Google Patents
Apparatus and method of detecting defect of steel plate Download PDFInfo
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- CN105874329A CN105874329A CN201380081616.XA CN201380081616A CN105874329A CN 105874329 A CN105874329 A CN 105874329A CN 201380081616 A CN201380081616 A CN 201380081616A CN 105874329 A CN105874329 A CN 105874329A
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
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Abstract
Provided are an apparatus and a method for detecting a defect of a steel plate. The apparatus for detecting a defect of a steel plate comprises: a magnetization unit for generating a magnetic flux for magnetizing a steel plate through a first magnetic pole and a second magnetic pole; and a magnetic flux leakage detection unit for detecting the intensity of a magnetic flux leakage leaking as the generated magnetic flux passes through the defect, wherein the magnetic flux leakage detection unit is arranged to be spaced apart in the forwarding direction or opposite direction of the steel plate from the center of the lower part of the first magnetic pole and the second magnetic pole, and comprises a first magnetic flux leakage detection part arranged on the opposite surface of the surface on which the magnetization unit is arranged between both surfaces of the steel plate; and a second magnetic flux leakage detection part which is arranged in the direction of the lower portion of at least one of the first magnetic pole and the second magnetic pole, and arranged on a surface on which the magnetization unit is arranged between both surfaces of the steel plate.
Description
Technical field
Present disclosure relates to the defects detection in steel plate.
Background technology
Ultrasound method for testing, flux leakage inspection is included for detecting the technology of the defect in steel plate
Method, magnetic particle inspection method, eddy current inspection method, optical means etc..
Flux leakage inspection method is based on and uses the magnetic sensing that magnetic flux is converted to the signal of telecommunication
Device (such as, Hall element) detection due to defect from the surface of steel plate magnetic flux at External leakage
The leakage magnetic flux measured after the intensity of amount detects the technology of the defect in steel plate.
In FIG, examine exemplified with the defect for steel plate utilizing foregoing leakages magnetic flux inspection method
Measurement equipment.
As illustrated in Fig. 1, the defect detection equipment for steel plate of correlation technique may include that
Magnetized spot (110), it generates magnetic flux will be in the steel on the driving direction of steel plate (S)
Plate (S) magnetizes；And array of magnetic sensors (121), it is disposed in the width of steel plate (S)
Spend on direction and detection magnetic flux of leakage when the magnetic flux created is through the defect in steel plate (S)
The intensity of amount.
Meanwhile, magnetized spot (210) can include permanent magnet (PM) and from permanent magnet
(PM) the first magnetization pole (111) and second that opposite side extends magnetizes pole (112).This
Outward, array of magnetic sensors (121) can be disposed in the first magnetization pole (111) and the second magnetization
On pole (112) and placed in the middle (in other words, to allow distance L1 and distance between which
L2 is equal to each other).The leakage magnetic flux measured by array of magnetic sensors (121) can be exaggerated
To predetermined strength with defect in detecting steel plate (S) time use.
It is said that in general, the intensity of the leakage magnetic flux caused by the defect in steel plate (S) may be
Center between one magnetization pole and the second magnetization pole (111,112) is minimum.On the contrary, along with
The defect driving steel plate (S) to include magnetizes pole (111,112) close to the first magnetization pole and second,
The intensity of leakage magnetic flux becomes more and more higher.Therefore, identical with the equipment with aforementioned related art
Mode, is disposed in the first magnetization pole (111) and the second magnetization at array of magnetic sensors (121)
In the case of center between pole (112), it is understood that there may be need to increase by array of magnetic sensors
(121) problem of the amplification of the leakage magnetic flux measured.
Additionally, letting out that the array of magnetic sensors (121) by being arranged in aforementioned structure is measured
Leakage magnetic flux not only includes be present on the surface of steel plate (S) but also be present in the whole of its inside
Defect.Accordingly, there exist will not to be detected separately and be present in the internal inside of steel plate (S) and lack
The problem fallen into.
Patent document 1: Korean Patent Publication No. 2013-0068295 (publication date: 2013 6
The moon 26).
Summary of the invention
Technical problem
The one side of present disclosure can provide a kind of defect detection equipment for steel plate and side
Method, wherein can detect the defect in steel plate, and especially, can be even with relatively low amplification
Rate only detects the internal flaw in steel plate.
Technical scheme
According to the first aspect of present disclosure, a kind of defect detection equipment for steel plate can wrap
Including: a magnetized spot, it generates magnetic flux to magnetize pole by steel by the first magnetization pole and second
Plate magnetizes；And, a leakage magnetic flux detector unit, its detection is worked as generated magnetic flux and is passed
The intensity of the leakage magnetic flux of leakage during one defect.Additionally, this leakage magnetic flux detector unit can be wrapped
Include: the first leakage magnetic flux detector unit, its be arranged on the driving direction of this steel plate or with
On the direction that this driving direction is contrary and be in this first magnetization pole and second magnetization pole below and place
Center between this first magnetization pole and the second magnetization pole is spaced apart, and is disposed in and is somebody's turn to do
The surface of in the middle of two opposed surface of steel plate, to be provided with this magnetized spot steel plates is contrary
Steel plate surface position on；And the second leakage magnetic flux detector unit can be included, it is arranged
The lower section of at least one in this first magnetization pole or this second magnetization extremely, and it is disposed in this steel
The position on the surface of in the middle of the said two opposed surface of plate, to be provided with this magnetized spot steel plate
On.
According to the one side of present disclosure, the defect detection equipment for steel plate can be based on passing through
This first leakage magnetic flux detector unit detection leakage magnetic flux intensity and by this second magnetic leakage
The intensity of the leakage magnetic flux of logical detector unit detection only detects the internal flaw in steel plate.
This first leakage magnetic flux detector unit can be disposed in such a position: in this position
In, the magnetic flux on the direction vertical with this steel plate in the magnetic flux generated by this magnetized spot
Component is about the maximum absolute value of the differential value of the driving direction of this steel plate.
According to the one side of present disclosure, the defect detection equipment for steel plate may include that one
Individual whole defect detection unit, it is based on the leakage detected by this first leakage magnetic flux detector unit
The intensity of magnetic flux detects and includes the surface defect being present on the surface of steel plate and be present in steel plate
Whole defects of interior internal flaw；And a surface defects detection unit, its base can also be included
In about the predetermined detection region detected by these whole defect detection units by this second magnetic leakage
The intensity of the leakage magnetic flux of logical detector unit detection detects the surface defect of this steel plate.
Defect detection equipment for steel plate can also include a data processing unit, at these data
Reason unit is by lacking the surface by the detection of this surface defects detection unit about this detection region
Fall into get rid of from the whole defects detected by these whole defect detection units and only detect this detection region
Present in internal flaw.
Defect detection equipment for steel plate can also include an image-display units, and this image shows
Show unit show about in whole defects, surface defect and the internal flaw in this detection region extremely
Few one.
These whole defect detection units may be provided for detecting about being disposed with in this detection region
First defective data of position of whole defects.Additionally, this surface defects detection unit is all right
The second number of defects about the position being disposed with the surface defect detected in this detection region is provided
According to.Additionally, the second defective data that this data processing unit can pass through to be provided is from being provided
The first defective data deduct and only detect internal flaw present in this detection region.
This first defective data can be the region representation by there is whole defect in this detection region
For binary digit " 1 " and to there will be no the region representation of whole defect be binary digit " 0 "
Data.Additionally, surface defect can will be there is in this detection region in this second defective data
Region representation is binary digit " 1 " and the region representation that there will be no surface defect is binary system
The data of digital " 0 ".
This leakage magnetic flux detector unit can include that (MR senses for Hall element, magnetoresistive transducer
Device), (GMI senses for giant magneto-resistance sensor (GMR) and giant magnetic impedance sensor
Device) at least one.
This leakage magnetic flux detector unit can be configured so that layout on the width of this steel plate
Multiple leakage magnetic flux detector units.
According to the second aspect of present disclosure, a kind of defect inspection method for steel plate can wrap
Include: the first step, generate magnetic flux with by the first magnetization pole and the second magnetization pole by magnetized spot
Steel plate is magnetized；Second step, is examined based on by the first leakage magnetic flux by whole defect detection units
The intensity of the leakage magnetic flux surveying unit detection detects the table including being present on the surface of this steel plate
Planar defect and the whole defects of internal flaw being present in this steel plate；3rd step, about by being somebody's turn to do
All predetermined detection regions of defect detection unit detection, by surface defects detection unit based on logical
The intensity of the leakage magnetic flux crossing the second leakage magnetic flux detector unit detection lacks to the surface detecting steel plate
Fall into；And the 4th step, about this detection region, by getting rid of to come from whole defects by surface defect
Only detection is present in the internal flaw in this detection region.
This defect inspection method for steel plate can also include being closed by image-display units display
At least one in whole defects, surface defect or the internal flaw in this detection region.
This first leakage magnetic flux detector unit can be arranged on the driving direction of this steel plate or
On the direction contrary with this driving direction and be in the first magnetization pole and second magnetization pole below and
The center being between this first magnetization pole and the second magnetization pole is spaced apart, and is disposed in this
The surface phase with the steel plate being provided with this magnetized spot in the middle of two opposed surface of steel plate
On the position on the surface of anti-steel plate；And, this second leakage magnetic flux detector unit, it can be by
It is arranged in this first magnetization pole or the lower section of the second magnetization pole, and is disposed in described the two of this steel plate
On the position on the surface of this in the middle of individual contrary surface, to be provided with this magnetized spot steel plate.
This first leakage magnetic flux detector unit can be disposed in such a position: in this position
In putting, the magnetic flux on the direction vertical with this steel plate in the magnetic flux generated by this magnetized spot
Amount component is about the maximum absolute value of the differential value of the driving direction of this steel plate.
In this second step, it is provided that about being disposed with detect whole in this detection region
First fault detection data in the region of defect；In the 3rd step, it is provided that about in this inspection
Survey second fault detection data in the region being disposed with the surface defect detected in region, Yi Ji
In 4th step, can pass through the second defective data provided from the first number of defects provided
Internal flaw present in this region is only detected according to deducting.
This first defective data can be the region representation by there is whole defect in this detection region
For binary digit " 1 " and to there will be no the region representation of whole defect be binary digit " 0 "
Data.Additionally, surface defect can will be there is in this detection region in this second defective data
Region representation is binary digit " 1 " and the region representation that there will be no surface defect is binary system
The data of digital " 0 ".
This first leakage magnetic flux detector unit or this second leakage magnetic flux detector unit can include suddenly
That sensor, magnetoresistive transducer (MR sensor), giant magneto-resistance sensor (GMR)
And at least one in giant magnetic impedance sensor (GMI sensor).
This first leakage magnetic flux detector unit or this second leakage magnetic flux detector unit can be set
For the multiple leakage magnetic flux detector units arranged on the width of this steel plate.
Beneficial effect
According to an exemplary in present disclosure, examine by allowing to will leak out magnetic flux
Survey unit be arranged towards magnetize pole be in the first magnetization pole and second magnetization pole below and be in
The spaced apart preset distance in center between first magnetization pole and the second magnetization pole, can be even
With the defect in relatively low amplification detection steel plate.
Additionally, according to another exemplary in present disclosure, cloth can will be passed through
Put below the first magnetization pole and the second magnetization pole and between the first magnetization pole and the second magnetization pole
The surface defect of steel plate that detects of the second leakage magnetic flux detector unit from by be arranged to from
Magnetize below pole and be in the first magnetization pole and second between first magnetization pole and the second magnetization pole
The first leakage magnetic flux detector unit of the spaced apart preset distance in center detect whole
Defect eliminating only detects the internal flaw in steel plate.
Accompanying drawing explanation
Fig. 1 is the view of the configuration of the defect detection equipment for steel plate illustrating prior art.
Fig. 2 be illustrated on the width of steel plate obtain according in present disclosure
The view of the defect detection equipment for steel plate of exemplary.
Fig. 3 is the component Y of the magnetic flux illustrating the position depending on leakage magnetic flux detector unit
Differential value and the view of leakage magnetic flux intensity.
Fig. 4 be illustrated on the width of steel plate obtain according to another in present disclosure
The defect for steel plate including the first leakage magnetic flux detector unit of individual exemplary is examined
The view of measurement equipment.
Fig. 5 is to be illustrated in the case of leakage magnetic flux detector unit is arranged in below magnetization pole by depositing
The view of the intensity of the leakage magnetic flux that the defect being on the surface of steel plate causes.
Fig. 6 is the view that the data processing unit in diagrammatic illustration 4 only detects the process of internal flaw.
Fig. 7 be illustrate according to an exemplary in present disclosure for steel plate
The flow chart of defect inspection method.
Detailed description of the invention
Hereinafter, the exemplary in present disclosure will be described in detail with reference to the attached drawings.
But, present disclosure can be presented and be not construed as to be restricted at this in many different forms
The embodiment illustrated.On the contrary, it is provided that these embodiments are so that this disclosure is thoroughly
With complete, and will fully pass on to those skilled in the art and scope of the present disclosure.Drawing
In, for the sake of clarity, the shape of meeting amplifier element and yardstick, and identical ginseng will be used in the whole text
Examine numeral and specify identical or similar element.
Fig. 2 be illustrated in the width (D2) of steel plate upper obtain according in present disclosure
The view of the defect detection equipment for steel plate of an exemplary.
With reference to Fig. 2, magnetized spot (210) can generate magnetic flux will be in steel plate (S)
On driving direction (X-direction) steel plate (S) magnetization, and can include permanent magnet (PM) with
And first magnetization pole (211) and second magnetization pole (212), described first magnetize pole (211)
It is the yoke extended from the both sides of permanent magnet (PM) with the second magnetization pole (212).First magnetization pole
(211) distance between and the second magnetization pole (212) is represented as D1, and aforementioned permanent magnet
(PM) can replace with the electromagnet using coil.
Additionally, the first leakage magnetic flux detector unit (221) can be an array of magnetic sensors,
Let out when the magnetic flux generated by magnetized spot (210) is through the defect in steel plate (S) with detection
The intensity of the leakage magnetic flux of leakage.
According to an exemplary in present disclosure, as illustrated in Fig. 2, first
Leakage magnetic flux detector unit (221) can be disposed in the first magnetization pole (211) and the second magnetization
Below pole (212) and between the first magnetization pole (211) and the second magnetization pole (212), with
Driving direction (X-direction) at steel plate (S) upper or on opposite to that direction be in
First magnetization pole (211) and second magnetizes lower section, pole (212) and is in the first magnetization pole (211)
And the spaced apart preset distance in the center (C) (L) that second between magnetization pole (212),
And can be disposed on the position on the surface (S2) being provided with steel plate, surface (S2) and steel plate
(S) in the middle of two surfaces (S1) and (S2), be disposed with magnetized spot (210) on it
The surface (S1) of steel plate contrary.
According to an exemplary in present disclosure, the first leakage magnetic flux detector unit
(211) position of a preset distance (L) spaced apart with center (C) can correspond to this
One position of sample: in this position, in the magnetic flux generated by magnetized spot (210),
Flux component on the direction vertical with the driving direction of steel plate (S) (X-direction) micro-
The maximum absolute value (describing later referring to Fig. 3) of score value.
By permission, the first leakage magnetic flux detector unit (221) is arranged in as described above
Defect on position, in amplification detection steel plate that can be relatively low.With reference to Fig. 3, it will be described detailed
Thin description.
Fig. 3 is the component Y of the magnetic flux illustrating the position depending on the first leakage magnetic flux detector unit
Differential value and the view of intensity of leakage magnetic flux.(a) of Fig. 3 is exemplified with the first leakage magnetic flux
The position of detector unit, (b) of Fig. 3 is exemplified with depending on the first leakage magnetic flux detector unit
The differential of position, magnetic flux on the direction vertical with the driving direction of steel plate component Y
Value, and (c) of Fig. 3 is exemplified with the leakage of the position depending on the first leakage magnetic flux detector unit
The intensity of magnetic flux.In figure 3, A, B and C instruction is disposed in and arranges based on steel plate (S)
The second leakage magnetic flux detection on the surface (S1) of steel plate and the position of magnetized spot (210) is single
Unit (222).Additionally, A ', B ' and C ' instruction are disposed in and arrange steel plate based on steel plate (S)
Surface (S2) position on the first leakage magnetic flux detector unit (221), surface (S2)
Contrary with the surface (S1) arranging magnetized spot (210) above it.
As illustrated in (b) of Fig. 3, dividing at the magnetic flux generated by magnetized spot (210)
Amount Y is about the situation of the differential value (dBy/dX) of the driving direction (X-direction) of steel plate (S)
Under, can confirm that on the driving direction (X-direction) of steel plate (S), its differential value from
Below first magnetization pole (211) and the second magnetization pole (212) and in the first magnetization pole (211)
With second center between magnetization pole (212) (A/A ') is to predetermined point (C/C ') gradually
Increase.
As illustrated in (c) of Fig. 3, in defect (including surface defect and internal flaw)
In the case of being present in steel plate (S), can confirm that driving direction (the X side at steel plate (S)
To) on, the intensity of the leakage magnetic flux detected is also from being in the first magnetization pole (211) and second
Magnetization pole (212) lower section and be in the first magnetization pole (211) and second magnetize pole (212) it
Between center (A/A ') be gradually increased to predetermined point (C/C ').However, it is possible to confirm the
One leakage magnetic flux detector unit (221) is disposed in lower surface (S2) lower section of steel plate (S) and (changes
Yan Zhi, is disposed on the position on the surface (S2) arranging steel plate (S), surface (S2) with
In the middle of the contrary surface (S1) of steel plate (S) and (S2), be provided with magnetized spot
(210) surface (S1) of steel plate is contrary) the leakage magnetic flux of situation (A ', B ' and C ')
Intensity 312 is disposed in the upper table of steel plate (S) higher than the second leakage magnetic flux detector unit (222)
Top, face (S1) (in other words, is disposed in two contrary surfaces (S1) of steel plate (S)
(S2) in the middle of, arrange on the surface (S1) of steel plate and the position of magnetized spot (210))
The leakage magnetic flux intensity 311 of situation (A, B and C).
Therefore, according to an exemplary, the first leakage magnetic flux detector unit is (in Fig. 2
(221)) can be arranged on the driving direction of steel plate (S) or in opposite to that direction
Go up and be in the first magnetization pole (211) and the second magnetization pole (212) lower section and be in the first magnetic
Change the center (C in Fig. 2) between pole (211) and the second magnetization pole (212) spaced apart
One preset distance (L in Fig. 2), and the surface (S2) that steel plate (S) is set can be disposed in
Position on, two contrary surfaces (S1) of surface (S2) and steel plate (S) and (S2)
The surface (S1) of central, to be provided with magnetized spot (210) steel plate (S) is contrary.
Additionally, the first leakage magnetic flux detector unit (211) makes a reservation for center (C) spaced apart
The position of distance (L in Fig. 2) can correspond to such a position: in this position, by
In the magnetic flux that magnetized spot (210) generates, the magnetic flux on the direction vertical with steel plate divides
Measure the absolute value of the differential value (dBy/dX) of the driving direction (X-direction) about steel plate (S)
Maximum.Thus, it is also possible to even with the defect in relatively low amplification detection steel plate (S).
Fig. 4 be illustrated on the width of steel plate obtain according to another in present disclosure
The defect for steel plate including the first leakage magnetic flux detector unit of individual exemplary is examined
The view of measurement equipment.Additionally, Fig. 5 is to be illustrated in leakage magnetic flux detector unit to be disposed in magnetization pole
The intensity of the leakage magnetic flux caused by the defect on the surface being present in steel plate in the case of Xia Fang
View, and Fig. 6 is that the data processing unit in diagrammatic illustration 4 only detects regarding of the process of internal flaw
Figure.
According to the exemplary illustrated in Fig. 4, for the defect detection equipment of steel plate
In addition to including the parts illustrated in Fig. 2, it is also possible to include the second leakage magnetic flux detector unit
(222), whole defect detection units (410), surface defects detection unit (420) and
Data processing unit (430).
Hereinafter, with reference to Fig. 4 to Fig. 6, will be described according to another in present disclosure
The defect detection equipment for steel plate of individual exemplary.
As illustrated in Fig. 4, the first leakage magnetic flux detector unit (221) can be that a magnetic passes
Sensor array, with detection when the magnetic flux generated by magnetized spot (210) is through steel plate (S)
The intensity of the leakage magnetic flux of leakage during defect (surface defect or internal flaw).About detect
The data of the intensity of leakage magnetic flux can be passed to whole defect detection unit (410).
As described above, the first leakage magnetic flux detector unit (221) can be arranged in
The driving direction (X-direction) of steel plate (S) is upper or on opposite to that direction and be in the
One magnetization pole (211) and second magnetizes lower section, pole (212) and is in the first magnetization pole (211)
And the spaced apart preset distance in the center (C) (L) that second between magnetization pole (212),
And can be disposed on the position on the surface (S2) that steel plate (S) is set, surface (S2) with
In the middle of two contrary surfaces (S1) of steel plate (S) and (S2), be provided with magnetization
Partly the surface (S1) of the steel plate (S) of (210) is contrary.Additionally, the first leakage magnetic flux detection
The position of unit (221) preset distance spaced apart with center (C) (L) can be corresponding
In such a position: in this position, magnetic flux direction on vertical with steel plate (S) divides
Measure the maximum absolute value of differential value of the driving direction (X-direction) about steel plate (S) (after a while
Describe with reference to Fig. 3).
All defect detection unit (410) can be based on by the first leakage magnetic flux detector unit (221)
The intensity of the leakage magnetic flux of detection detects and includes that the surface being present on the surface of steel plate (S) lacks
Whole defects of the internal flaw fallen into and be present in steel plate (S).In other words, in leakage magnetic flux
Intensity is equal to or higher than in the case of predetermined value, and whole defect detection units (410) may determine that
Internal flaw or surface defect are present in steel plate (S).The whole defects detected can be passed
It is delivered to data processing unit (430).
Additionally, all defect detection unit (410) may be provided for detecting region about at one
In be disposed with first defective data in region of the whole defects detected.
In other words, as illustrated in figure 6, whole defect detection units (410) can will close
In being disposed with whole defect (internal flaw (IDF) and surface defect in detection region (610)
(SDF) first defective data in region) is supplied to data processing unit (430).At this
In the case of, the first defective data can be will to there is whole defect (IDF in detection region (610)
And SDF) region representation be binary digit " 1 " and the region table that there will be no whole defect
It is shown as the data of binary digit " 0 ".
Meanwhile, the second leakage magnetic flux detector unit (222) can be a Magnetic Sensor battle array
Row, with detection when the magnetic flux generated by magnetized spot (210) is through the defect in steel plate (S)
The intensity of the leakage magnetic flux of leakage time (in detail, through surface defect).The magnetic leakage detected
Logical intensity can be passed to surface defects detection unit (420).
According to an exemplary in present disclosure, aforementioned second leakage magnetic flux detection
Unit (222) can be disposed in the first magnetization pole (211) or the second magnetization pole (212)
At least one below, and two opposed surface (S1, S2) of steel plate (S) can be disposed in
On the position on the surface (S1) of central, to be provided with magnetized spot (210) steel plate (S).
In an exemplary embodiment, the second leakage magnetic flux detector unit (222) can be set
On the position on surface (S2) being provided with steel plate (S), surface (S2) and steel plate (S)
Two contrary surfaces (S1, S2) in the middle of, be provided with magnetized spot (210)
The surface (S1) of steel plate (S) is contrary.
Second leakage magnetic flux detector unit (222) can be arranged on the first magnetization pole (211) or
Second magnetization pole (212) lower section, because magnetic flux is in the first magnetization pole (211) and the second magnetization
Below pole (212), on the direction vertical with the width of steel plate (S) (seeing T in Fig. 6)
Generate.In the case, as illustrated in Fig. 5, surface defect (see the surface in Fig. 6
Defect (SDF)) intensity of leakage magnetic flux (511) that generates is even above by internal flaw (ginseng
See the internal flaw in Fig. 6 (IDF)) intensity of leakage magnetic flux (512) that generates.In these feelings
Under condition, the leakage magnetic flux of detection can be the flux component on the direction vertical with steel plate (S).
But, according to an exemplary in present disclosure, vertical with steel plate (S)
Direction on the intensity of flux component be so high that its intensity is beyond the second magnetic leakage
In the case of the detection range of logical detector unit (222), can detect leakage magnetic flux component it
In the intensity of horizontal component.
It follows that surface defects detection unit (420) can based on by whole defects detection
By in the region ((620) in Fig. 6) that predetermined detection region that unit (410) detects is identical
The intensity of the leakage magnetic flux that two leakage magnetic flux detector units (222) detect only detects steel plate (S)
Surface defect.In other words, in the case of the intensity of leakage magnetic flux equals to or higher than predetermined value,
Surface defects detection unit (420) may determine that surface defect is present on steel plate (S).Detection
To surface defect can be passed to data processing unit (430).
Additionally, surface defects detection unit (420) may be provided for about cloth within a detection region
It is equipped with second defective data in the region of the surface defect detected.
In other words, as illustrated in Fig. 6, surface defects detection unit (420) can by about
Second defective data in the region of surface defect (SDF) it is disposed with in detection region (620)
It is supplied to data processing unit (430).In the case, the second defective data can be to lack
The region representation that there is surface defect (SDF) in sunken region (620) is binary digit " 1 "
And there will be no the data that region representation is binary digit " 0 " of surface defect (SDF).
In the case, detection region (610) and detect region (620) and refer in steel plate (S) each other
Identical region.
Meanwhile, data processing unit (430) can by will in detection region (620) by
The surface defect that surface defects detection unit (420) detects is from by whole defect detection units (410)
Whole defects eliminating of detection only detects internal flaw present in this detection region.
In detail, as illustrated in Fig. 6, data processing unit (430) can use subtractor
(630) in the detection region (620) will transmitted by surface defects detection unit (420)
Second defective data is from the detection region (610) transmitted by whole defect detection units (410)
In the first defective data in deduct and only detect the inside being present in detection region (640) and lack
Fall into (IDF).
Although detection region 610,620 and 640 has different reference numbers in figure 6, but
It it is the identical region that refers on the surface of steel plate (S), described detection region.
Finally, image-display units (440) can show about detection region whole defects,
At least one in surface defect or internal flaw.Image-display units (440) can include showing
Show equipment etc..
First leakage magnetic flux detector unit (221) and the second leakage magnetic flux detector unit (222) can
To include Hall element, magnetoresistive transducer (MR sensor), giant magneto-resistance sensor (GMR
Sensor) and giant magnetic impedance sensor (GMI sensor) at least one.Additionally,
First leakage magnetic flux detector unit or the second leakage magnetic flux detector unit can be configured so that at steel plate
(S) the multiple leakage magnetic flux detector units arranged on width.
As described above, according to an exemplary in present disclosure, pass through
Allow to will leak out flux detection unit to be arranged towards magnetizing pole and being in the first magnetization pole and second
Magnetize below pole and be in the center spaced apart between the first magnetization pole and the second magnetization pole
Preset distance, it might even be possible to the relatively low defect in amplification detection steel plate.
Additionally, according to another exemplary in present disclosure, can be by leading to
Cross the second leakage magnetic flux detector unit detection being arranged in below the first magnetization pole and the second magnetization pole
Steel plate surface defect from by be arranged to be in the first magnetization pole and second magnetization pole below
And the spaced apart preset distance in center being between the first magnetization pole and the second magnetization pole
Whole defects of the first leakage magnetic flux detector unit detection are got rid of the inside only detecting in steel plate and are lacked
Fall into.
Fig. 7 be illustrate according to an exemplary in present disclosure for steel plate
The flow chart of defect inspection method.
Hereinafter, with reference to figs. 2 to Fig. 7, the inspection according to an exemplary will be described
The method of the internal flaw in survey steel plate.But, in order to simplify present disclosure, will omit and figure
The description describing overlap of 2 to Fig. 6.
First, with reference to figs. 2 to Fig. 7, magnetized spot (210) can generate magnetic flux, to incite somebody to action
Steel plate (S) magnetization being on the driving direction (X-direction) of steel plate (S).
It follows that all defect detection unit (410) can be based on by the first leakage magnetic flux detection
The intensity of the leakage magnetic flux that unit (221) detects detects the surface including being present in steel plate (S)
On surface defect and whole defects (S702) of internal flaw of being present in steel plate (S).
In other words, in the case of the intensity of leakage magnetic flux equals to or higher than predetermined value, whole defects detection
Unit (410) may determine that internal flaw or surface defect are present in steel plate (S).Detect
Whole defects can be passed to data processing unit (430).
In the case, as illustrated in Fig. 2, the first leakage magnetic flux detector unit (221) can
To be arranged on the driving direction (X-direction) of steel plate (S) or in opposite to that direction
Go up and be in the first magnetization pole (211) and the second magnetization pole (212) lower section and be in the first magnetic
Change the spaced apart preset distance of center C between pole (211) and the second magnetization pole (212)
L, and can be disposed on the position on the surface (S2) being provided with steel plate (S), surface (S2)
With in the middle of two contrary surfaces (S1, S2) of steel plate (S), be provided with magnetized portion
The surface (S1) dividing the steel plate (S) of (210) is contrary.Additionally, the first leakage magnetic flux detection is single
The position of unit's (221) preset distance (L) spaced apart with center (C) can correspond to
Such a position: in this position, magnetized spot (210) in the magnetic flux generated with
The differential value of the flux component on direction that the driving direction (X-direction) of steel plate (S) is vertical
Maximum absolute value.
It follows that surface defects detection unit (420) can be based on examining with by whole defects
Survey in the region that unit (410) the predetermined detection region detected is identical and examined by the second leakage magnetic flux
The intensity surveying the leakage magnetic flux that unit (222) detects only detects the surface defect of steel plate (S)
(S703).In other words, in the case of the intensity of leakage magnetic flux equals to or higher than predetermined value, table
Planar defect detector unit (420) may determine that surface defect is present on steel plate (S).Detect
Surface defect can be passed to data processing unit (430).
In the case, the second leakage magnetic flux detector unit (222) can be disposed in the first magnetic
Change immediately below pole (211) or the second magnetization pole (212), and steel plate (S) can be disposed in
Two opposed surface (S1) and (S2) in the middle of, be provided with magnetized spot (210)
Steel plate (S) surface (S1) position on.In an exemplary embodiment, second
Leakage magnetic flux detector unit (222) can be disposed in the surface (S2) arranging steel plate (S)
Position, surface (S2) with in the middle of two contrary surfaces (S1, S2) of steel plate (S),
The surface (S1) of the steel plate being disposed with magnetized spot (210) on it is contrary.
Finally, data processing unit (430) can be by by being lacked by surface about detection region
The surface defect that sunken detector unit (420) detects detects from by whole defect detection units (410)
Whole defects get rid of only detect be present in detection region in internal flaw (S704).
Described above, according to an exemplary in present disclosure, by permitting
Permitted to will leak out that flux detection unit is arranged towards magnetizing pole and be in the first magnetization pole and second
Magnetize below pole and be in the center spaced apart between the first magnetization pole and the second magnetization pole
Preset distance, can be even with the defect in relatively low amplification detection steel plate.
Additionally, according to another exemplary in present disclosure, cloth can will be passed through
Put the steel that the second leakage magnetic flux detector unit below the first magnetization pole and the second magnetization pole detects
The surface defect of plate from by be arranged to be in the first magnetization pole and second magnetization pole below and from
First of the spaced apart preset distance in center between the first magnetization pole and the second magnetization pole
Whole defects eliminating of leakage magnetic flux detector unit detection only detects the internal flaw in steel plate.
Although above it has been illustrated and described that many exemplary, but art technology
Personnel will become apparent from, on the premise of without departing from the scope of the present invention as defined by the appended claims
Much remodeling and variant can be made.
Claims (18)
1. for a defect detection equipment for steel plate, including:
One magnetized spot, it generates magnetic flux to magnetize pole by steel by the first magnetization pole and second
Plate magnetizes；And
One leakage magnetic flux detector unit, its detection leakage when the magnetic flux generated is through defect
The intensity of leakage magnetic flux；
Wherein this leakage magnetic flux detector unit includes:
First leakage magnetic flux detector unit, its be arranged on the driving direction of this steel plate or with
On the direction that this driving direction is contrary and be in this first magnetization pole and second magnetization pole below and place
Center between this first magnetization pole and the second magnetization pole is spaced apart, and is disposed in this steel
The surface with the steel plate being provided with this magnetized spot in the middle of two opposed surface of plate is contrary
Steel plate surface position on；And,
Second leakage magnetic flux detector unit, it is disposed in this first magnetization pole or this second magnetization pole
In the lower section of at least one, and be disposed in the middle of the said two opposed surface of this steel plate,
On the position on the surface being provided with this steel plate of this magnetized spot.
Defect detection equipment for steel plate the most according to claim 1, wherein said use
In the defect detection equipment of steel plate based on the leakage detected by this first leakage magnetic flux detector unit
The intensity of magnetic flux and the intensity by the leakage magnetic flux of this second leakage magnetic flux detector unit detection are next
Only detect the internal flaw in this steel plate.
Defect detection equipment for steel plate the most according to claim 1, wherein this first
Leakage magnetic flux detector unit is disposed in such a position: in this position, by this magnetic
Changing in the magnetic flux that part generates, the flux component on the direction vertical with this steel plate is about this
The maximum absolute value of the differential value of the driving direction of steel plate.
Defect detection equipment for steel plate the most according to claim 1, also includes: one
Individual whole defect detection unit, it is based on the leakage detected by this first leakage magnetic flux detector unit
The intensity of magnetic flux detects and includes the surface defect being present on the surface of this steel plate and be present in this
Whole defects of the internal flaw in steel plate；One surface defects detection unit, its based on about by
The predetermined detection region of these whole defect detection units detection is single by the detection of this second leakage magnetic flux
The intensity of the leakage magnetic flux of unit's detection detects the surface defect of this steel plate.
Defect detection equipment for steel plate the most according to claim 4, also includes one
Data processing unit, this data processing unit by by about this detection region by this surface defect
The surface defect of detector unit detection is from the whole defects row detected by these whole defect detection units
Remove and only detect internal flaw present in this detection region.
Defect detection equipment for steel plate the most according to claim 5, also includes one
Image-display units, this image-display units shows the whole defects about this detection region, surface
At least one in defect and internal flaw.
Defect detection equipment for steel plate the most according to claim 5, wherein these are whole
Defect detection unit also provides for about the position being disposed with the whole defects detected in this detection region
The first defective data put,
This surface defects detection unit also provides for being disposed with, about in this detection region, the table detected
Second defective data of the position of planar defect, and
This data processing unit is by lacking the second defective data provided from first provided
Sunken data deduct and only detect internal flaw present in this detection region.
Defect detection equipment for steel plate the most according to claim 7, wherein this first
Defective data is in this detection region to be binary digit " 1 " by the region representation that there is whole defect
And there will be no the data that region representation is binary digit " 0 " of whole defect, and
Second defective data is in this detection region to be two to enter by the region representation that there is surface defect
Make numeral " 1 " and there will be no the data that region representation is binary digit " 0 " of surface defect.
Defect detection equipment for steel plate the most according to claim 1, wherein this leakage
Flux detection unit includes that Hall element, magnetoresistive transducer (MR sensor), giant magnetoresistance pass
In sensor (GMR) and giant magnetic impedance sensor (GMI sensor) at least one
Individual.
Defect detection equipment for steel plate the most according to claim 1, wherein this leakage
Flux detection unit is arranged on the width of this steel plate the multiple leakage magnetic flux inspection arranged
Survey unit.
11. 1 kinds of defect inspection methods for steel plate, including:
The first step, generates magnetic flux with by the first magnetization pole and the second magnetization pole by magnetized spot
Steel plate is magnetized；
Second step, is examined based on by the first leakage magnetic flux detector unit by whole defect detection units
The intensity of leakage magnetic flux surveyed detect the surface defect including being present on the surface of this steel plate and
Whole defects of the internal flaw being present in this steel plate；
3rd step, about the predetermined detection region detected by these whole defect detection units, is passed through
Surface defects detection unit is based on the leakage magnetic flux by the second leakage magnetic flux detector unit detection
Intensity detects the surface defect of steel plate；And
4th step, about this detection region, only examines by surface defect being got rid of from whole defects
Survey and be present in the internal flaw in this detection region.
12. defect inspection methods for steel plate according to claim 11, also include leading to
Cross image-display units and show whole defects, surface defect or internal flaw about this detection region
In at least one.
13. defect inspection methods for steel plate according to claim 11, wherein this
One leakage magnetic flux detector unit be arranged on the driving direction of this steel plate or with this driving side
Go up in the opposite direction and be in below the first magnetization pole and the second magnetization pole and be in this first magnetic
Change the center between pole and the second magnetization pole spaced apart, and be disposed in two phases of this steel plate
The table of the steel plate that the surface with the steel plate being provided with this magnetized spot in the middle of anti-surface is contrary
On the position in face；And
This second leakage magnetic flux detector unit is disposed in this first magnetization pole and the second magnetization extremely
The lower section of at least one, and be disposed in the middle of the said two opposed surface of this steel plate, set
On the position on the surface being equipped with this steel plate of this magnetized spot.
14. is according to claim 11 in the defect inspection method of steel plate, wherein should
First leakage magnetic flux detector unit is disposed in such a position: in this position, by
In the magnetic flux that this magnetized spot generates, the flux component on the direction vertical with this steel plate is closed
The maximum absolute value of differential value in the driving direction of this steel plate.
15. is according to claim 11 in the defect inspection method of steel plate, Qi Zhong
In this second step, it is provided that about the region being disposed with the whole defects detected in this detection region
The first fault detection data,
In the 3rd step, it is provided that be disposed with, about in this detection region, the surface defect detected
Second fault detection data in region, and
In the 4th step, by by the provided second defective data from the first defect provided
Data deduct and only detect internal flaw present in this region.
16. defect inspection methods for steel plate according to claim 15, wherein this
One defective data is to be binary digit by there is the region representation of whole defect in this detection region
" 1 " and there will be no the data that region representation is binary digit " 0 " of whole defect, and
This second defective data is to be two by there is the region representation of surface defect in this detection region
Binary digits " 1 " and there will be no the number that region representation is binary digit " 0 " of surface defect
According to.
17. defect inspection methods for steel plate according to claim 11, wherein this
One leakage magnetic flux detector unit or this second leakage magnetic flux detector unit include Hall element, magnetic resistance
Sensor (MR sensor), giant magneto-resistance sensor (GMR) and giant magnetic impedance
At least one in sensor (GMI sensor).
18. defect inspection methods for steel plate according to claim 11, wherein this
One leakage magnetic flux detector unit or this second leakage magnetic flux detector unit are arranged at this steel plate
The multiple leakage magnetic flux detector units arranged on width.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| KR1020130154036A KR101657745B1 (en) | 2013-12-11 | 2013-12-11 | Apparatus and method of detecting defect of steel plate |
| KR10-2013-0154036 | 2013-12-11 | ||
| PCT/KR2013/012076 WO2015088089A1 (en) | 2013-12-11 | 2013-12-24 | Apparatus and method for inspecting defect of steel plate |
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| CN105874329B CN105874329B (en) | 2019-03-01 |
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| CN201380081616.XA Active CN105874329B (en) | 2013-12-11 | 2013-12-24 | Detect the device and method of the defect of steel plate |
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|---|---|
| US (1) | US10088453B2 (en) |
| EP (1) | EP3081932B1 (en) |
| JP (1) | JP6248201B2 (en) |
| KR (1) | KR101657745B1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108226173A (en) * | 2016-12-15 | 2018-06-29 | 蒂森克虏拉塞斯坦有限公司 | For checking the method and apparatus of steel band |
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| US10408764B2 (en) | 2017-09-13 | 2019-09-10 | Applied Materials Israel Ltd. | System, method and computer program product for object examination |
| CN111751440B (en) * | 2020-06-17 | 2022-07-01 | 清华大学 | Steel defect internal and external magnetic disturbance comprehensive detection device and detection method |
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| KR20150068157A (en) | 2015-06-19 |
| WO2015088089A8 (en) | 2015-08-13 |
| US10088453B2 (en) | 2018-10-02 |
| JP2017501401A (en) | 2017-01-12 |
| KR101657745B1 (en) | 2016-09-19 |
| EP3081932A4 (en) | 2016-12-21 |
| EP3081932A1 (en) | 2016-10-19 |
| EP3081932B1 (en) | 2021-03-10 |
| CN105874329B (en) | 2019-03-01 |
| JP6248201B2 (en) | 2017-12-13 |
| US20160313285A1 (en) | 2016-10-27 |
| WO2015088089A1 (en) | 2015-06-18 |
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